CN103752944A - Saw blade clamping and mobile device for hydraulic automatic pipe cutting machine - Google Patents

Saw blade clamping and mobile device for hydraulic automatic pipe cutting machine Download PDF

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Publication number
CN103752944A
CN103752944A CN201410016736.8A CN201410016736A CN103752944A CN 103752944 A CN103752944 A CN 103752944A CN 201410016736 A CN201410016736 A CN 201410016736A CN 103752944 A CN103752944 A CN 103752944A
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China
Prior art keywords
saw blade
hydraulic cylinder
block
clamping device
hydraulic
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Pending
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CN201410016736.8A
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Chinese (zh)
Inventor
林勇
丁述勇
宋士刚
杨友东
钱少明
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Zhijiang College of ZJUT
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Zhijiang College of ZJUT
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Priority to CN201410016736.8A priority Critical patent/CN103752944A/en
Publication of CN103752944A publication Critical patent/CN103752944A/en
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Abstract

The invention relates to a saw blade clamping and a mobile device for a hydraulic automatic pipe cutting machine. A saw blade is mounted on an output shaft of a first motor through a reversing speed reducer which is fixed on the side of a moving block; the other side of the moving block is installed on a guide rail disposed on the side of a head; a first stopper and a second stopper are installed on the side of the head, which is close to the moving block; the upper side of the moving block is connected on a piston rod of a first hydraulic cylinder which is connected with a hydraulic system; a cylinder of the first hydraulic cylinder is mounted on the upper end surface of the head; a first clamping device component installed on a frame is located right below the saw blade; a second clamping device component is connected on a piston rod of a second hydraulic cylinder fixed on the frame through a base; a limiting plate equipped with a sliding scale is installed on the piston rod of the second hydraulic cylinder; a static scale corresponding to the sliding scale is mounted on the frame. With the saw blade clamping and mobile device, automation is realized when the pipe cutting machine is cutting the saw blade, and thus, impact on the saw blade is smaller.

Description

A kind of fluid pressure type automatic cutter for steel pipes saw blade clamping and mobile device
Technical field
The present invention relates to a kind of machinery for steel pipe cutting, relate in particular to a kind of fluid pressure type automatic cutter for steel pipes saw blade clamping and mobile device.
Background technology
Steel pipe is a kind of widely used foundation class product, and it can, for delivery of fluid and powdery solid, manufacturing machine part and container, also can be used as the support of various parts, as products such as the support bar of office desk and chair, mechanical jacks.
When producing certain type product, all need steel pipe to carry out fixed length cutting, one important procedure essential in production process, but current steel tube cutting machine is take hand cut equipment and semi-automatic cutting equipment as main, while particularly cutting substantially all by manually pressing lever operated cutting, seldom have the cutting equipment that can realize steel pipe automatic charging, this has also caused using steel pipe low as raw-material part manufacturing enterprise automatization level, has restricted the development of enterprise; And manually press handle cutting and time cannot accurately control feed speed, speed often during saw blade contact steel pipe, therefore larger to the impact of sawtooth, cause sawtooth wearing and tearing comparatively fast also than being easier to, to break; Along with going deep into of steel pipe cutting, steel pipe cutting quantity increases, and resistance increases, and feed speed reduces, and has reduced cutting efficiency.
These reasons have caused using steel pipe low as raw-material part manufacturing enterprise automatization level, have seriously restricted the development of enterprise.So, in actual processing cutting process, be starved of particularly surface trimming and saw blade is had to the cutting equipment of certain protective role of a set of full automation.
Existing steel tube cutting machine is used the major defect of artificial cutting as follows:
1, the overall working (machining) efficiency of artificial cutting impact;
2, cannot accurately control feed speed, speed often during saw blade contact steel pipe is larger to the impact of sawtooth;
3, along with going deep into that steel pipe cuts, cutting quantity increases, and resistance increases, and feed speed reduces, and has reduced cutting efficiency.
Summary of the invention
In order to overcome the deficiency of existing steel tube cutting machine, substantially all the shortcoming operating by manually pressing handle while particularly cutting, the invention provides a kind of fluid pressure type automatic cutter for steel pipes saw blade clamping and mobile device, the automation while having realized the cutting of steel tube cutting machine saw blade.
For achieving the above object, the present invention is achieved by the following technical solutions:
A kind of fluid pressure type automatic cutter for steel pipes saw blade clamping and mobile device, comprise head, the first clamping device assembly, the first hydraulic cylinder, the first motor, saw blade, the first block, the second block, movable block, frame, communtation deceleration device, base, the second hydraulic cylinder and hydraulic system, described saw blade is installed on by communtation deceleration device on the output shaft of the first motor, described communtation deceleration device is fixed on the side of movable block, the opposite side of described movable block is installed on the guide rail of head side, described the first block and the second block are arranged on the side of head near movable block, described the first block and the second block capable of regulating height position, the upside of described movable block is connected on the piston rod of the first hydraulic cylinder, described hydraulic system is connected with the first hydraulic cylinder, the cylinder body of described the first hydraulic cylinder is installed on the upper surface of head, described the first clamping device assembly be installed in frame and be positioned at saw blade under, the first clamping device assembly has a structure and identical the second clamping device of the first clamping device along the direction of feed of steel pipe, described the second clamping device is connected on the piston rod of the second hydraulic cylinder, described the second hydraulic cylinder is fixed in frame by base, limiting plate is also installed on the piston rod of the second hydraulic cylinder, on described limiting plate, slide rule is installed, the quiet chi corresponding with slide rule is installed in described frame.
Described hydraulic system, comprises fuel tank, filter, the second motor, hydraulic pump, overflow valve, pressure meter switch, Pressure gauge, solenoid-operated proportional reversal valve and choke valve; Liquid level gauge and air filter are installed on described fuel tank, described the second motor is connected with hydraulic pump, the inlet port of described hydraulic pump connects fuel tank through filter, high pressure oil content three tunnels of the oil-out of hydraulic pump, the first via is by pressure meter switch cut-in pressure table, the second tunnel takes back fuel tank by overflow valve, Third Road connects the oil-in of solenoid-operated proportional reversal valve, the oil-out of solenoid-operated proportional reversal valve leads to fuel tank, and two other hydraulic fluid port of solenoid-operated proportional reversal valve is connected with choke valve and the first hydraulic cylinder successively.
The first described clamping device assembly, comprises hold-down support, piston rod, slide; Described hold-down support is fixed in frame, and a side of hold-down support is provided with the 3rd hydraulic cylinder, and hold-down support opposite side is connected on piston rod by slide.
On the first described block, primary importance sensor is installed, the second described block is provided with second place sensor, and the 3rd adjustable position sensor of high and low position and the 4th position sensor are also installed between the first block on described head and the second block successively.
Beneficial effect of the present invention is as follows:
Fluid pressure type automatic cutter for steel pipes saw blade clamping of the present invention and mobile device the first hydraulic cylinder are connected to hydraulic pressure delivery side of pump by choke valve and solenoid-operated proportional reversal valve, and saw blade can be realized the feeding of different directions and speed; The first clamping device is installed in the frame under saw blade, along the direction of feed of steel pipe, there are one and identical the second clamping device of the first clamping device structure, the second clamping device is connected on the piston rod that is fixed on the second hydraulic cylinder in frame, on the piston rod of the second hydraulic cylinder, also by limiting plate, slide rule is installed, corresponding quiet chi is installed in frame, can control the Cutting Length of steel pipe; Automation when the present invention can realize the cutting of steel tube cutting machine saw blade, and make the impact of saw blade less.
Accompanying drawing explanation
Fig. 1 is side-looking structural representation of the present invention;
Fig. 2 is main TV structure schematic diagram of the present invention;
Fig. 3 is the present invention's the first clamping device assembly assumption diagram;
Fig. 4 is hydraulic system principle figure of the present invention;
In figure: 1 is head, 2 is the first clamping device assembly, 3 is the first hydraulic cylinder, 4 is the first motor, 5 is saw blade, 6 is the first block, 7 is the second block, 8 is movable block, 9 is frame, 10 is communtation deceleration device, 11 is steel pipe, 12 is the second clamping device, 13 is limiting plate, 14 is base, 15 is the second hydraulic cylinder, 16 is slide rule, 17 is quiet chi, 18 is the 3rd hydraulic cylinder, 19 is hold-down support, 20 is piston rod, 21 is slide, 22 is fuel tank, 23 is liquid level gauge, 24 is air filter, 25 is filter, 26 is the second motor, 27 is hydraulic pump, 28 is overflow valve, 29 is pressure meter switch, 30 is Pressure gauge, 31 is solenoid-operated proportional reversal valve, 32 is choke valve, 33 is primary importance sensor, 34 is second place sensor, 35 is the 3rd position sensor, 36 is the 4th position sensor.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
As shown in Figure 1, 2, fluid pressure type automatic cutter for steel pipes saw blade clamping of the present invention and mobile device include head 1, the first clamping device assembly 2, the first hydraulic cylinder 3, the first motor 4, saw blade 5, the first block 6, the second block 7, movable block 8, frame 9, communtation deceleration device 10, the second clamping device 12, limiting plate 13, base 14, the second hydraulic cylinder 15, slide rule 16, quiet chi 17 and hydraulic system; Saw blade 5 is installed on by communtation deceleration device 10 on the output shaft of the first motor 4, and therefore the output shaft rotation of the first motor 4 can drive saw blade 5 to rotate.
Communtation deceleration device 10 is fixed on the side of movable block 8, and the opposite side of movable block 8 is provided with several slide blocks, and several slide blocks are installed on the guide rail of head 1 side, and therefore, movable block 8 can drive the first motor 4 on the guide rail of head 1, to do upper and lower rectilinear motion.
The upside of movable block 8 is connected on the piston rod of the first hydraulic cylinder 3, the cylinder body of the first hydraulic cylinder 3 is installed on the upper surface of head 1, therefore, the flexible of the piston rod of the first hydraulic cylinder 3 can drive movable block 8, the first motor 4 and saw blade 5 to move on the guide rail of head 1.
Head 1 is also equipped with respectively the first adjustable block 6 of high and low position and the second block 7 near two positions up and down of movable block 8 one sides, when a projection on movable block 8 is encountered the first block 6 above being positioned at, show that saw blade 5 moves to highest position, the piston rod of the first hydraulic cylinder 3 stops shortening; When a projection on movable block 8 is encountered the second block 7 below being positioned at, show that saw blade 5 moves to its lowest position, the piston rod of the first hydraulic cylinder 3 stops extending.
The first clamping device assembly 2 be installed in frame 9 and be positioned at saw blade 5 under, the first clamping device assembly 2 clamp steel pipe 11 and be positioned at saw blade 5 under, saw blade 5 pipe cuttings 11 can not produce additional stress, cutting more easily easily.
The first clamping device assembly 2 has a structure and identical the second clamping device 12 of the first clamping device assembly 2 along the direction of feed of steel pipe 11, and the second clamping device 12 also can clamp steel pipe 11.
The second clamping device 12 is connected on the piston rod of the second hydraulic cylinder 15, and the second hydraulic cylinder 15 is fixed in frame 9 by base 14, and therefore, the flexible of the second hydraulic cylinder 15 piston rods can drive the second clamping device 12 to move.
Limiting plate 13 is also installed on the piston rod of the second hydraulic cylinder 15 in addition, slide rule 16 is installed on limiting plate 13, corresponding quiet chi 17 is installed in frame 9, when the second clamping device 12 moves, limiting plate 13 is also moving, and slide rule 16, with respect to quiet chi 17 relative motions, can be measured the displacement of limiting plate 13, be also the displacement of the second clamping device 12.
As shown in Figure 3, the second clamping device 12 is identical with the structure of the first clamping device assembly 2, and the first described clamping device assembly 2, comprises the 3rd hydraulic cylinder 18, hold-down support 19, piston rod 20, slide 21; Hold-down support 19 is fixed in frame 9, and a side of hold-down support 19 is provided with the 3rd hydraulic cylinder 18, and opposite side has slide 21 to be connected on the piston rod of the 3rd hydraulic cylinder 18, therefore, hold-down support 19 maintains static, and when the 3rd hydraulic cylinder 18 piston rods are flexible, drives slide 21 to move; When the 3rd hydraulic cylinder 18 piston rods shorten, drive slide 21 near hold-down support 19, and steel pipe 11 is clamped; When the 3rd hydraulic cylinder 18 piston rods extend, drive slide 21 away from hold-down support 19, and steel pipe 11 is unclamped.
As shown in Figure 4, described hydraulic system, comprises fuel tank 22, liquid level gauge 23, air filter 24, filter 25, the second motor 26, hydraulic pump 27, overflow valve 28, pressure meter switch 29, Pressure gauge 30, solenoid-operated proportional reversal valve 31, choke valve 32; Liquid level gauge 23 and air filter 24 are installed on fuel tank 22, and liquid level gauge 23 can be monitored the height of fuel tank 22 interior liquid, and air filter 24 can be removed the air atom impurity entering in fuel tank 22; The second motor 26 is connected with hydraulic pump 27 through shaft coupling, and the inlet port of hydraulic pump 27 can drive hydraulic pump 27 to rotate through filter 25 connected tank 22, the second motors 26 oil is pumped up from fuel tank 22; High pressure oil content three tunnels of the oil-out of hydraulic pump 27, the first via is passed through pressure meter switch 29 cut-in pressure tables 30, the pressure that Pressure gauge 30 gets final product in display tube; The second tunnel takes back fuel tank 22 by overflow valve 28, controls the pressure in hydraulic tube, exceedes certain pressure and gets back in fuel tank 22; Third Road connects the oil-in of solenoid-operated proportional reversal valve 31, the oil-out of solenoid-operated proportional reversal valve 31 leads to fuel tank 22, two other hydraulic fluid port of solenoid-operated proportional reversal valve 31 is series throttle 32 and the first hydraulic cylinder 3 successively, and solenoid-operated proportional reversal valve 31 can be controlled elongating or shortening of the first hydraulic cylinder 3 and flexible speed.
Due to what adopt, it is solenoid-operated proportional reversal valve 31, the first hydraulic cylinder 3 elongate or shorten and flexible speed is that direction of feed and the speed of saw blade 5 can be controlled according to demand, when saw blade 5 down moves to while also not touching steel pipe 11 at highest point, owing to being idle stroke, can allow saw blade 5 down move fast; When saw blade 5 touches steel pipe 11 at once, for reducing to impact, the feed speed of controlling saw blade 5 should be less; After cutting is stable, in order to improve cutting efficiency, should again improve the feed speed of saw blade 5; Cut complete after, saw blade 5 need to be got back to peak position, is also at this moment idle stroke, also can adopt fast and move upward.
On the first described block 6, primary importance sensor 33 is installed, the second block 7 is provided with second place sensor 34, and high and low position adjustable the 3rd position sensor 35, the 4th position sensor 36 are also installed between the first block 6 on head 1 and the second block 7 successively, elongating or shortening and flexible speed of the first hydraulic cylinder 3, can in program, set, the adjustable position sensor in several positions also can be installed on head 1, primary importance sensor 33, second place sensor 34, the 3rd position sensor 35, the 4th position sensor 36, the first block 6, primary importance sensor 33 and second place sensor 34 are installed respectively on the second block 7, between the first block 6 and the second block 7, the 3rd position sensor 35 is installed, the 4th position sensor 36, when head 1 moves up to the first block 6, primary importance sensor 33 detects and moves to peak, the piston rod stop motion of the first hydraulic cylinder 3, when head 1 has just started to move downward, owing to being idle stroke, can allow saw blade 5 down move fast, when moving to the 3rd position sensor 35 place, the 3rd position sensor 35 detects to be that saw blade 5 touches steel pipe 11 at once, and the feed speed of controlling saw blade 5 should be less, saw blade 5 continues to move downward, and when moving to the 4th position sensor 36, shows that cutting enters the stabilization sub stage, in order to improve cutting efficiency, improves the feed speed of saw blade 5 again, saw blade 5 continues cutting downwards, until move to the second block 7, second place sensor 34 detects that to be that steel pipe 11 cuts complete, and it is that saw blade 5 is return fast until the first block 6 places that the piston rod of the first hydraulic cylinder 3 shrinks fast.
The high and low position of the first block 6, the second block 7 and the 3rd position sensor 35, the 4th position sensor 36 is adjustable, and when the diameter of steel pipe 11 is different, the position of adjusting four position sensors can adapt to the cutting of the steel pipe 11 of different-diameter.
When steel pipe need to cut, its workflow is as follows:
(1) feed mechanism is sent steel pipe 11 come to, and the first clamping device assembly 2 clamps steel pipe 11;
(2) first motors 4 drive saw blade 5 to rotate;
The piston rod rapid elongation of (3) first hydraulic cylinders 3 drives the top of saw blade 5 to steel pipe 11;
The piston rod of (4) first hydraulic cylinders 3 extends Speed Reduction, and saw blade 5 starts pipe cutting 11;
(5) after cutting is stablized, the piston rod elongation speed of the first hydraulic cylinder 3 improves, and improves cutting speed and efficiency;
(6) when movable block 8 is encountered the second block 7, show that steel pipe cutting is complete, the piston rod of the first hydraulic cylinder 3 stops extending, and oppositely shorten and move upward fast, when movable block 8 is encountered the first block 6, show that saw blade 5 moves to highest position, the piston rod of the first hydraulic cylinder 3 stops shortening;
(7) the above-mentioned cutting that completes 11 1 sections of steel pipes, feed mechanism is sent steel pipe 11 to again, repeats the step of (1)-(6), until final stage;
(8) after the steel pipe 11 that final stage need to cut is sent to by feed mechanism, the second hydraulic cylinder 15 piston rods extend, drive the second clamping device 12 and limiting plate 13 to move to the side near the first clamping device assembly 2, slide rule 16 records on limiting plate 13 move to leftmost position;
(9) second clamping devices 12 clamp steel pipe 11, the first clamping device assembly 2 unclamps steel pipe 11, the second hydraulic cylinder 15 piston rods shorten, drive the second clamping device 12, steel pipe 11 and limiting plate 13 away from the first clamping device assembly 2, slide rule 16 on limiting plate 13 moves on quiet chi 17, when slide rule 16 measures mobile distance and reaches requirement, the second hydraulic cylinder 15 piston rods stop shortening;
(10) first clamping device assemblies 2 clamp steel pipe 11, repeat the action of (2)-(6), complete the cutting of final stage.
Automation when fluid pressure type automatic cutter for steel pipes saw blade clamping of the present invention and mobile device can be realized the cutting of steel tube cutting machine saw blade, and make the impact of saw blade less.
Above-described embodiment is only for the inventive concept of the present invention of explaining, but not restriction to rights protection of the present invention, allly utilizes this design to carry out the change of unsubstantiality to the present invention, all should fall into protection scope of the present invention.

Claims (4)

1. fluid pressure type automatic cutter for steel pipes saw blade clamping and a mobile device, is characterized in that: comprise head, the first clamping device assembly, the first hydraulic cylinder, the first motor, saw blade, the first block, the second block, movable block, frame, communtation deceleration device, base, the second hydraulic cylinder and hydraulic system, described saw blade is installed on by communtation deceleration device on the output shaft of the first motor, described communtation deceleration device is fixed on the side of movable block, the opposite side of described movable block is installed on the guide rail of head side, described the first block and the second block are arranged on the side of head near movable block, described the first block and the second block capable of regulating height position, the upside of described movable block is connected on the piston rod of the first hydraulic cylinder, described hydraulic system is connected with the first hydraulic cylinder, the cylinder body of described the first hydraulic cylinder is installed on the upper surface of head, described the first clamping device assembly be installed in frame and be positioned at saw blade under, the first clamping device assembly has a structure and identical the second clamping device of the first clamping device along the direction of feed of steel pipe, described the second clamping device is connected on the piston rod of the second hydraulic cylinder, described the second hydraulic cylinder is fixed in frame by base, limiting plate is also installed on the piston rod of the second hydraulic cylinder, on described limiting plate, slide rule is installed, the quiet chi corresponding with slide rule is installed in described frame.
2. fluid pressure type automatic cutter for steel pipes saw blade clamping as claimed in claim 1 and mobile device, it is characterized in that: described hydraulic system, comprises fuel tank, filter, the second motor, hydraulic pump, overflow valve, pressure meter switch, Pressure gauge, solenoid-operated proportional reversal valve and choke valve; Liquid level gauge and air filter are installed on described fuel tank, described the second motor is connected with hydraulic pump, the inlet port of described hydraulic pump connects fuel tank through filter, high pressure oil content three tunnels of the oil-out of hydraulic pump, the first via is by pressure meter switch cut-in pressure table, the second tunnel takes back fuel tank by overflow valve, Third Road connects the oil-in of solenoid-operated proportional reversal valve, the oil-out of solenoid-operated proportional reversal valve leads to fuel tank, and two other hydraulic fluid port of solenoid-operated proportional reversal valve is connected with choke valve and the first hydraulic cylinder successively.
3. fluid pressure type automatic cutter for steel pipes saw blade clamping as claimed in claim 1 and mobile device, is characterized in that: the first described clamping device assembly, comprises hold-down support, piston rod, slide; Described hold-down support is fixed in frame, and a side of hold-down support is provided with the 3rd hydraulic cylinder, and hold-down support opposite side is connected on piston rod by slide.
4. fluid pressure type automatic cutter for steel pipes saw blade clamping as claimed in claim 1 and mobile device, it is characterized in that: on the first described block, primary importance sensor is installed, the second described block is provided with second place sensor, and the 3rd adjustable position sensor of high and low position and the 4th position sensor are also installed between the first block on described head and the second block successively.
CN201410016736.8A 2014-01-15 2014-01-15 Saw blade clamping and mobile device for hydraulic automatic pipe cutting machine Pending CN103752944A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104070230A (en) * 2014-07-08 2014-10-01 梅晓萌 Saw cutting machine
CN104889493A (en) * 2015-06-10 2015-09-09 长兴捷明机械有限公司 Metal pipe cutting device
CN104907627A (en) * 2015-06-09 2015-09-16 济南德华一机床设备有限公司 Pipe blank saw
CN105817694A (en) * 2016-06-02 2016-08-03 常州市航标精密机械设备有限公司 Steel pipe cutting machine
CN105935802A (en) * 2016-06-17 2016-09-14 新兴铸管股份有限公司 Fixed-size saw cutting device for plastic-steel composite pressure pipe
CN107999871A (en) * 2017-12-04 2018-05-08 金世杰 A kind of steel pipe cutting equipment easy to fix to clamp
CN108145030A (en) * 2017-12-26 2018-06-12 汕头市东方科技有限公司 A kind of aluminium pot tank mouth roll threading device
CN108723492A (en) * 2018-05-03 2018-11-02 中鼎恒盛气体设备(芜湖)有限公司 A kind of diaphragm groove cutting machine
CN111872476A (en) * 2020-07-21 2020-11-03 武汉金仑汽配有限公司 Saw blade anti-burst device of pipe fitting pipe cutting machine and anti-burst operation method
CN113474137A (en) * 2020-02-21 2021-10-01 贝斯荷兰有限公司 Sawing device and method for forming a saw cut in a semiconductor product

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104070230A (en) * 2014-07-08 2014-10-01 梅晓萌 Saw cutting machine
CN104907627A (en) * 2015-06-09 2015-09-16 济南德华一机床设备有限公司 Pipe blank saw
CN104889493A (en) * 2015-06-10 2015-09-09 长兴捷明机械有限公司 Metal pipe cutting device
CN105817694A (en) * 2016-06-02 2016-08-03 常州市航标精密机械设备有限公司 Steel pipe cutting machine
CN105935802A (en) * 2016-06-17 2016-09-14 新兴铸管股份有限公司 Fixed-size saw cutting device for plastic-steel composite pressure pipe
CN107999871A (en) * 2017-12-04 2018-05-08 金世杰 A kind of steel pipe cutting equipment easy to fix to clamp
CN107999871B (en) * 2017-12-04 2019-04-02 宜昌凯鑫建筑工程有限公司 A kind of steel pipe cutting equipment convenient for fixing to clamp
CN108145030A (en) * 2017-12-26 2018-06-12 汕头市东方科技有限公司 A kind of aluminium pot tank mouth roll threading device
CN108723492A (en) * 2018-05-03 2018-11-02 中鼎恒盛气体设备(芜湖)有限公司 A kind of diaphragm groove cutting machine
CN113474137A (en) * 2020-02-21 2021-10-01 贝斯荷兰有限公司 Sawing device and method for forming a saw cut in a semiconductor product
US11935764B2 (en) 2020-02-21 2024-03-19 Besi Netherlands B.V. Sawing device and method for forming saw-cuts into a semiconductor product
CN111872476A (en) * 2020-07-21 2020-11-03 武汉金仑汽配有限公司 Saw blade anti-burst device of pipe fitting pipe cutting machine and anti-burst operation method

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